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+/*
+ * Copyright (c) 2007 Sun Microsystems, Inc. All Rights Reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * - Redistribution of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistribution in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * Neither the name of Sun Microsystems, Inc. or the names of
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * This software is provided "AS IS," without a warranty of any kind. ALL
+ * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
+ * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
+ * MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
+ * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
+ * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
+ * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
+ * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
+ * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
+ * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
+ * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+ *
+ * You acknowledge that this software is not designed or intended for use
+ * in the design, construction, operation or maintenance of any nuclear
+ * facility.
+ */
+
+package net.java.joglutils.msg.elements;
+
+import javax.media.opengl.*;
+
+import net.java.joglutils.msg.math.*;
+import net.java.joglutils.msg.misc.*;
+import net.java.joglutils.msg.nodes.*;
+
+/** Represents the depth test state of the OpenGL fixed-function pipeline. */
+
+public class DepthTestElement extends Element {
+
+ // Boilerplate
+ private static StateIndex index = State.registerElementType();
+ public StateIndex getStateIndex() { return index; }
+ public Element newInstance() {
+ return new DepthTestElement();
+ }
+ /** Returns the instance of this element in the passed State. */
+ public static DepthTestElement getInstance(State state) {
+ return (DepthTestElement) state.getElement(index);
+ }
+ /** Enables this element in the passed state, which should be the
+ default for a given action. */
+ public static void enable(State defaultState) {
+ DepthTestElement tmp = new DepthTestElement();
+ defaultState.setElement(tmp.getStateIndex(), tmp);
+ }
+ /** Indicates whether this element is enabled in the given default
+ state for a particular action. */
+ public static boolean isEnabled(State state) {
+ return (state.getDefaults().getElement(index) != null);
+ }
+
+ // TODO: eventually we'll want to add other state associated with
+ // depth testing, such as the the depth function and values
+ protected boolean enabled;
+
+ /** Sets the depth test state. */
+ public static void set(State state, boolean enabled) {
+ getInstance(state).setElt(enabled);
+ }
+
+ /** Returns whether depth testing is enabled. */
+ public static boolean getEnabled(State state) {
+ return getInstance(state).enabled;
+ }
+
+ public void push(State state) {
+ DepthTestElement prev = (DepthTestElement) getNextInStack();
+ if (prev != null) {
+ // Pull down the data from the previous element
+ enabled = prev.enabled;
+ }
+ }
+
+ /** Sets all of the portions of the depth test state in this element. */
+ public void setElt(boolean enabled) {
+ this.enabled = enabled;
+ }
+}